|mhorn||Дата: Sunday, 07.07.2013, 22:17 | Сообщение # 1|
|Barrón E., Comas-Rengifo M.J., Duarte L.V. (2013) Palynomorph succession of the Upper Pliensbachian–Lower Toarcian of the Peniche section (Portugal) // Comunicações Geológicas 100, Especial I, 55-61 |
The Peniche section in the Lusitanian Basin (western Portugal) provides an exceptional, continuous record of the Portuguese Lower Jurassic, and is the candidate for the Global Boundary Stratotype Section and Point for the base of the Toarcian. This paper reports a palynological study of the Margaritatus, Spinatum, Polymorphum and Levisoni zones. Forty eight levels yielded representative and well preserved palynomorph assemblages. Fifty seven palynomorph taxa were recorded: 19 spore taxa, 20 pollen taxa, 11 acanthomorph acritarchs, 4 prasinophytes and 3 dinocyst taxa. The Pliensbachian levels show a characteristic predominance of Classopollis and a wide diversity of aquatic palynomorphs. The Toarcian levels are characterised by the pollen grains of Spheripollenites and a progressive reduction in the diversity of aquatic palynomorphs.
Middle Jurassic - Lower Cretaceous ammonites & aptychi